The attorney for the Frisco woman accused of killing her son said Friday that the boy had medical problems. He will seek an outside opinion on the cause of the child’s death.

Arnav Dhawan, 10, was found dead Wednesday in an empty bathtub in the family’s home wrapped in a cloth and surrounded by plastic bags.

There was no evidence of fluid in his lungs to indicate drowning, nor was there any trauma to the body, said David Finn, who is representing the child’s mother, Pallavi Dhawan.

She was charged with murder on Thursday. Police said she nodded her head when asked if she had killed her son — an account her attorney vehemently denies.

The 38-year-old mother was released from the Frisco City Jail early Friday after posting bond set at $50,000.

Her husband, Sumeet Dhawan, told police that his wife is coping with mental health issues and that the couple was having marital problems, according to a search warrant affidavit released Friday.

Finn characterized his client as a good mother who is grieving the loss of her only child while trying to coordinate funeral services and cremation for the boy.

“She doted on him,” Finn said. “The husband is standing by his wife. He does not believe she harmed Arnav.”

He said the child was born in Wisconsin with a brain cyst and microcephaly, a condition characterized by a head circumference that is smaller than normal.

He said Arnav was a special-needs child who had other medical conditions. He did not elaborate.

While Finn did not say what medical conditions might have caused the child’s death, “that is certainly something I’m going to explore,” he said.

The Collin County medical examiner’s office has not ruled on the cause of the death, pending the results of a toxicology report.

Finn said said he would seek another opinion from Dr. Nizam Peerwani, Tarrant County chief medical examiner.

Based on information from police, Finn said, he believes the boy died two days before he was found by police.

When asked why the mother didn’t contact authorities, he had no answers.

“That’s the million-dollar question,” said Finn, who first talked to his client on Thursday through a glass window at the Frisco City Jail.

He said he didn’t ask his client how the child had died. “It was not the time or place for me to have a heart-to-heart conversation,” he said. “I’ve not gone there yet.”

He said his client was in a state of shock after the boy’s death and speculated that she may have been waiting for her husband to return home from his three-week business trip.

“They’re from India. It’s an arranged marriage. They’re both Hindu,” Finn said. “Culturally, it’s the husband who’s supposed to run the family.”

According to the search warrant affidavit, Sumeet Dhawan, a computer programmer, said he arrived home Wednesday just as his wife was leaving. He told police that she said she was going to pick up Arnav at an after-school tutoring center.

When she didn’t return home after a long period of time, the husband called police, the document stated.

Finn said the husband called police to report that his wife had been missing for two hours. He said officers were still at the door when his client returned.

When asked about the boy, Finn said, she asked to speak to her husband privately. “She said something like ‘He is no more,’” said Finn, reiterating that his client nodded in response to a question about the boy’s whereabouts in the home — not to a question about whether she had killed him.

“They wouldn’t have a reason to ask if she’d killed him because they hadn’t even found him yet,” Finn said.

He said his client “had a lot on her plate,” caring for a special-needs child by herself while her husband was away from home for long periods.

Finn said she had quit her job as a computer programmer to devote herself to her son and once jumped into the water to save him from drowning when he fell from a boat.

“Trying to reconcile that occurrence with an accusation of murder is difficult,” Finn said.